<template>
  <div id="app">
    <div class="container">
      <!-- 顶部搜索框模块 -->
      <div class="form-group">
        <div class="input-group">
          <h4>品牌管理</h4>
        </div>
      </div>

      <!-- 数据表格 -->
      <table class="table table-bordered table-hover mt-2">
        <thead>
          <tr>
            <th>编号</th>
            <th>资产名称</th>
            <th>价格</th>
            <th>创建时间</th>
            <th>操作</th>
          </tr>
        </thead>
        <tbody v-if="list.length !== 0">
          <tr v-for="item in list" :key="item.id">
            <td>{{ item.id }}</td>
            <td>{{ item.name }}</td>

            <!-- 如果价格超过100，就有red这个类 -->
            <td :class="item.price > 100 ? 'red' : ''">{{ item.price }}</td>
            <td>{{ dateFormat(item.time) }}</td>
            <td><a href="#" @click.prevent="del(item.id)">删除</a></td>
          </tr>
          <tr style="background-color: #EEE">
            <td>统计:</td>
            <td colspan="2">总价钱为: {{ total }}</td>
            <td colspan="2">平均价: {{ avg }}</td>
          </tr>
        </tbody>
        <tfoot v-else>
          <tr>
            <td colspan="5" style="text-align: center">暂无数据</td>
          </tr>
        </tfoot>
      </table>

      <!-- 添加资产 -->
      <form class="form-inline">
        <div class="form-group">
          <div class="input-group">
            <input
              type="text"
              class="form-control"
              placeholder="资产名称"
              v-model.trim="name"
            />
          </div>
        </div>
        &nbsp;&nbsp;&nbsp;&nbsp;
        <div class="form-group">
          <div class="input-group">
            <input
              type="text"
              class="form-control"
              placeholder="价格"
              v-model.number="price"
            />
          </div>
        </div>
        &nbsp;&nbsp;&nbsp;&nbsp;
        <!-- 阻止表单提交 -->
        <button class="btn btn-primary" @click.prevent="add()">添加资产</button>
      </form>
    </div>
  </div>
</template>

<script>
import dayjs from 'dayjs'
export default {
  data () {
    return {
      // list: [
      //   { id: 100, name: '外套', price: 199, time: new Date('2010-08-12') },
      //   { id: 101, name: '裤子', price: 34, time: new Date('2013-09-01') },
      //   { id: 102, name: '鞋', price: 25.4, time: new Date('2018-11-22') },
      //   { id: 103, name: '头发', price: 19900, time: new Date('2020-12-12') }
      // ]
      list: JSON.parse(localStorage.getItem('grade')) || [],
      name: '',
      price: ''
    }
  },
  methods: {
    dateFormat (d) {
      return dayjs(d).format('YYYY-MM-DD HH:mm:ss')
    },
    add () {
      this.list.push({
        // id: this.list[this.list.length - 1].id + 1,
        id: +new Date(),
        name: this.name,
        price: this.price,
        date: new Date()
      }),
        (this.name = this.price = '')
    },
    del (id) {
      if(!confirm('你确定删除嘛')) return
      this.list = this.list.filter(item => item.id !== id)
    }
  },
  computed: {
    total () {
      if (this.list.length === 0) return 0
      return this.list.reduce((t, c) => t + c.price, 0)
    },
    avg () {
      if (this.list.length === 0) return 0
      return (this.total / this.list.length).toFixed(2)
    }
  },
  watch: {
    list (val) {
      localStorage.setItem('grade', JSON.stringify(val))
    }
  }
}
</script>

<style></style>
